| 五台山—恒山绿岩带Au-Ag-Cu成矿作用地球化学特征 |
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| 引用本文： | 赵善仁,吴悦斌.五台山—恒山绿岩带Au-Ag-Cu成矿作用地球化学特征[J].现代地质,1996,10(4):478-484. |
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| 作者姓名： | 赵善仁 吴悦斌 |
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| 摘 要： | 五台山—恒山绿岩带Ａｕ、Ａｇ、Ｃｕ矿床可分为二大类型：（１）再生型金银铜矿，产在包括岩浆岩在内的各类岩石断裂构造中，与岩浆期后热液有关；（２）变生型金银铜矿，产于各类变质岩中，具有层控特征（即绿岩型金矿）。在地球化学特征上，再生型矿床与变生型矿床相比，矿体及围岩中Ｍｏ、Ａｇ、Ｐｂ、Ｚｎ、Ｃｄ等成矿及伴生元素明显富集；Ｋ２Ｏ、Ｒｂ、Ｓｒ、Ｂａ、Ｔｈ、Ｕ也明显富集，是后期岩浆热液作用的结果；Ｈｇ、Ｆ的明显富集则与后期构造活动有关；Ｚｎ／Ｃｄ比值较低，说明受到后期岩浆侵入影响；Ｔｈ／Ｕ比值低，可能指示富钙的酸性岩环境。再生型Ａｕ矿化的元素组合为Ｃｄ、Ａｓ、Ｎｉ、Ａｇ、Ｓｂ、Ａｕ、Ｈｇ（Ｂｉ），再生型Ａｇ矿化的元素组合为Ａｓ、Ｓｂ、Ａｇ、Ｃｄ、Ｃｕ、Ｎｉ（Ｍｏ、Ｐｂ、Ｚｎ、Ｂｉ），变生型Ａｕ矿化的元素组合较简单，只为Ａｕ、Ｈｇ、Ａｓ或Ａｕ、Ｃｕ。上述地球化学特征不仅可以有效地区分矿化类型，而且可以作为地球化学找矿和评价的指标
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| 关 键 词： | 地球化学 成矿作用 矿床类型 金银铜矿床 绿岩带 五台山—恒山 |
GEOCHEMISTRY CHARACTERISTICS OF Au Ag Cu MINERALIZATION OF WUTAISHAN HENGSHAN GREENSTONE BELT |
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| Abstract: | Au Ag Cu deposits in Wutaishan Hengshan greenstone belt could be divided into two types: (Ⅰ) regenerated Au Ag Cu deposits, guesting in fractures of various rocks including magmatics and relating to postmagmatic hydrothermal process, (Ⅱ) metagenic Au Ag Cu deposits (namely greenstone type gold deposit), existing in a variety of metamorphic rocks and having strata bound features. Compared with Ⅱ type, the orebody of Ⅰ type and its host rocks contain high metallogenic and accompanying elements (Mo, Ag, Pb, Zn, Cd); high K 2O, Rb, Sr, Ba, Tu, U and low Zn/Cd, suggesting late magmatic hydrothermalism; high Hg and F, relating to late tectogenesis; and lower Th/U ratio, possibly indicating the environment of Ca rich acidic rocks. The association of elements for regenerated Au mineralization is Cd As Ni Ag Sb Au Hg(Bi), for regenerated Ag mineralization is As Sb Ag Cd Cu Ni(Mo Pb Zn Bi), and for metagenic Au mineralization is Au Hg As or Au Cu. Aforementioned geochemical characteristics can not only be used to distinguish mineralized types, but also act as indicators for geochemical prospection and evaluation. |
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| Keywords: | geochemistry mineralization type of deposit gold silver copper deposit greenstone belt Wutaishan Hengshan |
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